无法从Android 10上的BroadcastReceiver启动活动 [英] Can't start activity from BroadcastReceiver on android 10

问题描述

昨晚我将操作系统版本更新为android 10，从那时起，广播接收器中的startActivity函数什么都不做.这是我根据CommonsWare的答案尝试开始该活动的方法:

I updated my OS version to android 10 last night, and since then the startActivity function inside the broadcast receiver is doing nothing. This is how I try to start the activity based on the answer of CommonsWare:

Intent i = new Intent(context, AlarmNotificationActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { // This is at least android 10...

                Log.d("Debug", "This is android 10");
                // Start the alert via full-screen intent.
                PendingIntent startAlarmPendingIntent = PendingIntent.getBroadcast(context, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
                String CHANNEL_ID = "my_channel_02";
                NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
                        context.getString(R.string.notification_channel_name_second),
                        NotificationManager.IMPORTANCE_HIGH);
                NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                notificationManager.createNotificationChannel(channel);
                NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                        .setContentTitle("Um, hi!")
                        .setAutoCancel(true)
                        .setPriority(NotificationCompat.PRIORITY_HIGH)
                        .setFullScreenIntent(startAlarmPendingIntent, true);
                Log.d("Debug", "Try to load screen");
                notificationManager.notify(0, builder.build());

            }

日志显示我正在进入notify命令，但是什么也没有发生.我正在请求清单上的USE_FULL_SCREEN_INTENT权限，因此我应该能够使用全屏意图. 由于这个问题，我的应用现在无用了.有人知道如何解决吗?

The log shows that I am getting to the notify command but nothing happens. I am asking for USE_FULL_SCREEN_INTENT permission on the manifest so I should be able to use full-screen intents. My app is useless now because of that issue. Does anyone know how to solve it?

推荐答案

大约10个月前，宣布了Android 10对后台活动开始的限制.您可以在文档中了解更多信息.

Android 10's restriction on background activity starts was announced about six months ago. You can read more about it in the documentation.

使用具有相关的全屏Intent的高优先级通知.请参阅文档. 此示例应用通过使用WorkManager进行了演示触发需要提醒用户的后台事件.在那里，我使用高优先级通知，而不是直接启动活动:

Use a high-priority notification, with an associated full-screen Intent, instead. See the documentation. This sample app demonstrates this, by using WorkManager to trigger a background event needing to alert the user. There, I use a high-priority notification instead of starting the activity directly:

val pi = PendingIntent.getActivity(
  appContext,
  0,
  Intent(appContext, MainActivity::class.java),
  PendingIntent.FLAG_UPDATE_CURRENT
)

val builder = NotificationCompat.Builder(appContext, CHANNEL_WHATEVER)
  .setSmallIcon(R.drawable.ic_notification)
  .setContentTitle("Um, hi!")
  .setAutoCancel(true)
  .setPriority(NotificationCompat.PRIORITY_HIGH)
  .setFullScreenIntent(pi, true)

val mgr = appContext.getSystemService(NotificationManager::class.java)

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
  && mgr.getNotificationChannel(CHANNEL_WHATEVER) == null
) {
  mgr.createNotificationChannel(
    NotificationChannel(
      CHANNEL_WHATEVER,
      "Whatever",
      NotificationManager.IMPORTANCE_HIGH
    )
  )
}

mgr.notify(NOTIF_ID, builder.build())

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